Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1997-09-08
2000-01-25
Oen, William
Measuring and testing
Fluid pressure gauge
Photoelectric
25022714, 25022718, G01L 900, G01J 104, G01J 400
Patent
active
060167025
ABSTRACT:
A pressure sensor capable of measuring pressure in a harsh environment includes at least one intrinsic fiber optic sensor element formed within a core of an optical fiber. A length of the optical fiber containing the sensor element is attached to a pressure sensitive structure. A dimension of the pressure sensitive structure changes in response to changes in the pressure of a pressure field of the environment. The sensor element is responsive to all input signal and to a strain caused by changes in the dimension of the pressure sensitive structure for providing a pressure signal indicative of the pressure. A temperature compensation sensor is also formed in the fiber near the location of the pressure sensor. The temperature sensor is isolated from strain associated with the pressure for providing temperature compensation of the pressure sensor. Alternatively, temperature compensation is provided by an intrinsic fiber optic sensor element mounted to experience an equal but opposite strain associated with changes in the dimension of the pressure sensitive structure.
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CiDRA Corporation
Oen William
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